A free, open source, powerful tool for working with messy data
CDC Connectors for Apache Flink
Distributed database warehouse for transactions, search and analytics
SymmetricDS is database replication and file synchronization software
Apache IoTDB
Embeddable JSON Database engine C library
Cloud Database Manager
A relentless key-value store for the browser
A graph database that supports more than 100+ billion data
CrossUI is a free Cross-Browser Javascript framework
Easy to use open source fast database for search
Toolkit for working with and mapping geospatial data
jdl is a loader utility for moving data from (CSV or XML) into a db.
A Java SQL client for any JDBC compliant database
A powerful, cross platform, SQL database system
Relational Database
An object relational-mapping (ORM) library for Java
Deductive Database with Datalog, SQL, RA, TRC, DRC
Database Subsetter and Relational Data Browser
A generator of DTO, Model, and DAO classes to access relational DB
Java persistence using JDO, JPA or REST